Adjustable desk lamp



FIG. 1 is a side elevational view of an adjustable desk lamp showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is an opposite side elevational view thereof with the lamp arm in an alternate position. 

The ornamental design for adjustable desk lamp, as shown and described. 